Want to implement Constraint in system where Fe is in +2 State with constraint.

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Biraj Maskey

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Jun 30, 2025, 2:29:53 AMJun 30
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Dear all, 
I am trying to assign Fe +2 charge and here I have attached the input file as well. However, I need to fix atoms from 1 to 55 so I used constraint module but it is showing error. 

Best Regards,
BIraj
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Ángel Martín Albavera Mata

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Jun 30, 2025, 8:53:24 AMJun 30
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Please note that you are not specifying any geometry before this block

dft
  xc b3lyp
  mult 2
  maxiter 1020
end

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